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San Joaquin County <br /> C, Environmental Health Department DIRECTOR <br /> �.•_�f ..o M Donna Heran, REHS <br /> Z 2 600 East Main Street <br /> c: a PROGRAM COORDINATORS <br /> U { Stockton, California 95202-3029 Robert McClellon, REHS <br /> Jeff Carruesco,REHS, RDI <br /> !' Kasey Foley, REHS <br /> cq�fFo" Website: www.sjgov.org/ehd <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> June 3, 2010 <br /> Messrs. Kirk Larson, PG, and Robert Trommer, CHG <br /> State Water Resources Control Board <br /> Division of Financial Assistance <br /> 1001 1 Street <br /> Sacramento CA 95814 <br /> Subject: April and May 2010 Draft Five-Year Review Recommendations, Caseworker <br /> Harlin Knoll's Sites <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed the <br /> draft annual review five-year review update letter for various sites referenced below and <br /> comments as follows below. <br /> 574 Grant Line Road, Tracy, CA; Claim Number 13850: You recommended closure <br /> consideration for the site. The EHD has discussed the site with the responsible party's (RP) <br /> consultant and a site closure report is in preparation. The site has been under ozone <br /> remediation, and analytical results from groundwater samples collected from the site's <br /> monitoring wells appear to be favorable for closure consideration; however, confirmation grab <br /> groundwater sampling between ozone injection points and monitoring wells revealed elevated <br /> contaminant concentrations. The contaminant concentration in the British Petroleum (BP; site <br /> address 2375 Tracy Blvd., Tracy) monitoring well MW-6, located on the subject site is at <br /> concentrations consistent with those obtained in the confirmation samples. The confirmation <br /> samples results and the MW-6 contaminant concentrations appear to identify a plume of <br /> impacted groundwater with its core apparently near BP's MW-6; the plume appears to be <br /> delineated laterally based on the monitoring well network on the subject site, the BP site and the <br /> Chevron site at 575 Grant Line Rd. The closure report for the subject site should address the <br /> issues related to this plume directly, along with an evaluation of vapor intrusion and health risk <br /> potentials_ With a favorable report, the EHD should be able to start closure process and <br /> estimates final closure will be achieved in six to nine months. <br /> 632 S. EI Dorado Street, Stockton, CA; Claim Number 8828: You concurred with rebound <br /> monitoring of this site and probable review for closure. Results appear to be favorable and the <br /> site will be discussed with the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) representative at the June meeting between the EHD and CVRWQCB. <br /> 6332 E. Highway 88, Stockton, CA; Claim Number 13455: Your recommendation was that <br /> active remediation by soil vapor extraction (SVE) should commence or continue. Activation of <br /> the SVE system began in May 2010. The EHD is in agreement with your recommendation. <br /> April and May 2010 Annual 5-year Reviews HK Sites.doc <br />